As the last few years have somewhat shown, the MAC has not been consistently stronger than C-USA, especially when it comes to alumni base, market, attendance, and endowment. The MAC has drawn consistently terrible, in the last three years as in 'one season of above 25,000 attendance for the whole conference' terrible. Sun Belt Terrible.
Plus, the MWC can make a claim to have influence in maybe two major DMA's: Columbus and Cincinatti. Meanwhile, C-uSA can claim to have influence in Houston, Dallas, Orlando, Tidewater VA/Eastern NC, Tulsa, Memphis and El Paso. Plus, C-USA has consitently better saragin ratings, usually ranking around 10th while the MAC is behind several FCS conferences around 12th or 14th.
The logical thing to do would be to put all the conferences on a probationary period, even the Sun Belt. I think you'll find, after several years of analyzing computer rankings, top 25 polls, etc., that Conference USA and the MWC are the two worthy conferences.